This includes proteins that lack cysteine residues such as α-synuclein (Cai et al., 1994; Song and Wang, 1995; Cheng et al., 2010; Ranjan and Kumar, 2016), an amyloid-forming protein implicated in Parkinson’s Disease (Bisaglia et al., 2009). The gene discussed is SNCA; the disease is Parkinson disease.